ASP.NET覆盖cookie

Question

我无法覆盖cookie的值。用户第一次提交用户名时，cookie会在浏览器中正常存储，并且显示正确。但是，当用户尝试提交不同的用户名时，页面将刷新并且旧的cookie仍然设置。这是我希望可以理解的代码，任何帮助表示赞赏。

protected void Cookie_Encode(object sender, EventArgs e) 
{ 
     // Encoding username in Base64 
     var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(User_box.Text); 
     string Encoded_user = System.Convert.ToBase64String(plainTextBytes); 

     // Creating and setting the cookie 
     HttpCookie myCookie = new HttpCookie("UserSettings"); 
     myCookie["UserName"] = Encoded_user; 
     myCookie.Expires = DateTime.Now.AddDays(7d); 
     Response.Cookies.Add(myCookie); 

     Response.Redirect(Request.RawUrl); 
} 

Answer 1

使用DateTime.Now.AddDays(-1)而不是DateTime.Now.AddDays(7d)。

protected void Cookie_Encode(object sender, EventArgs e) 
{ 
    // Encoding username in Base64 
    var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(User_box.Text); 
    string Encoded_user = System.Convert.ToBase64String(plainTextBytes); 

    // Creating and setting the cookie 
    HttpCookie myCookie = new HttpCookie("UserSettings"); 
    myCookie["UserName"] = Encoded_user; 
    myCookie.Expires = DateTime.Now.AddDays(-1); 
    Response.Cookies.Add(myCookie); 

    Response.Redirect(Request.RawUrl); 
}